Royal Tichelaar Makkum Dutch Ceramic Hand painted Windmill no chips
BO 23 refers to the model or decor number
The initials are the mark of the specific painter
Piece are handmade and hand painted, following century old traditions of Delftware production.
It has about half inch indent to it. Not sure if plate or bowl
This came from a teacher friend who traveled. I don't imagine how it got it home without even a chip.